The attempt by homegrown private equity firm MBK Partners to acquire a stake in Hankook & Co. -- the holding company behind South Korean tire giant Hankook Tire & Technology -- has failed, but it has served as a wake-up call for Korean conglomerates with poor corporate governance. MBK’s move in the last few weeks for a hostile takeover of Korea's No. 1 tire company and its demand for the improvemen...